Thanks for all the great information.
One thing...
"since the Circlotron topology use the whole OPT primary coil , not only the half of the OPT primary coil which is normal for classic based OPT tube PP Amp ."
In a normal Class A PP amplifier the whole OPT primary is used by each tube.
Only in Class B is the output primary use one half by one tube and other half by the other tube.
"The best iron core for Circlotron output power stage it is not critical as for standard SE or PP based Amps"
This is not true at all.
If there was concerns like DC being present, etc. then compromises are made.
When there is no DC present then there is no reason for compromises.
The best transformer has no air gap in the core and has a core made of the highest permeability allowable for the power level intended.
The signal source (when it's pure AC as in this case) is only part of the equation as to it's impedance.
The transformer is not going to know if it's being feed from a PP circlotron or single ended parafeed or differential coming from a single ended to balanced bridging transformer or differential output opamp or whatever.....
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 08/20/11 08/20/11
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